Carburetor for internal-combustion engines



Dec. 11,1923. 1,477,280 v D. FORDES CARBURETOR FOR INTERNAL COMBUSTIONENGINES Filed Aug. 6, 1920 Q Patented Dec. 11,1923.

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DORE FORBES, F VIENNA, AUSTRIA, ASSIGNOR T0 FA. P. S.-VERGrdSER-UNDAPPA- RATEBAU-AK'IIENGESELLSCHAFT, 0F VIENNA, AUSTRIA.

Application filed August 6, 1920. Serial No. 491,817.

Toall whom'it may concern: Be it known that I, Donn Ponons, mechanicalengineer, a citizen of the Republic of Austria, and resident of Vienna,V. Mar-- garetenstrasse 105, Austria, have invented new and usefulImprovements in Carburetors for Internal Combustion Engines (for which Ihav filed applications for atents in Austria, filed March 9, 1917;ermany, filed March 16, 1917 andItaly, filed June 27, 1919), ofwhichthefollowing 1s a specification.

My invention relates to carburetors for internal. combustion engines ofthe type, in which the introduction or injection ofthe fuel into the airpassage is regulated in accordance with the working of the engine.

One obj ect is to effect improvementsin th construction of thebutterfiyvalve arranged in the air passage or intake pipe. A furtherobject of my invention is to provide means to supply the fuel to acentral chamber or bore of this valve, and to cause the fuel to beatomized and initially mixed with air while passing through said valveinto the intake pi e. e I p With t e above and other objects in view,the invention'consists in the construction,

combination and arrangement of devices hereinafter described andclaimed;

In the accompanying drawing, in which a preferred fgrm of the inventionis shown.- Fig. 1 is a vertical section of the same.

' Figs. 2 and 3 are detail sections respectively showing the butterflythrottle valve in closedand open positions.

In the drawing, a indicates the float tank, 7) the float, c the fuelpipe, 6 the usual intake pipe to the engine manifold, d the air intaketube located above the tank and 7f the throttle or butterfly valve,thickened in the center and having oppositely bevelled side walls whichconverge forwardly and rearward'ly as shown. Said valve'has the usualoperatinglever r, and has upper and lower tubular axes g, h. The lowerpart 71- reaches downwardly into the float tank and has at the lower endthe fuel intake noz- Zle i.

The body of the valve is provided with two co-axial suction ducts m andn and with a duct 0' inclined to the axle. .All these ducts communicatewith a central bore in the valve, as does also the vertical axial duct71-. A. slide valve Z operates in said bore, has its lower end bevelledon one side, and also has an operating rod provided with a hand wheel72.

The 0 eration of the carburetor is as fol-' lows 11 starting the engine,the throttle valve f (Fig. 2) is closed, suction taking places throughthe duct '11., so the fuel rlses through the nozzle 2' and the axialpipe 71., into the middle hole or bore of the butterfly throttle valve'.The fuel supply is regu-' lated by the air flowing through the duct m.Withthe parts in the position shown in Figure 2 which is the positionthe parts occupy In starting or idling, the passage n serves as amixture outlet passage from the fuel passage it while the passages 0 andwe admit air to said fuel passage. With the parts in the position shownin Figure 3, which is the position the parts occupy when the motor isrunning at high speed, the passages n and 0 both serve as mixture outletpassages while the passage m alone is an air inlet to the fuel passage72.. It will be obvious that with the parts in the position shown inFigure 3 with less air admitted to the fuel passage h and a greatermixture outlet area the flow of fuel from the passage Z will be greater.

Having now particularly described and ascertained the nature of myinvention,- what I claim is:

1Q In a carburetor, an. intake pipe, a butterfly valve in said intakepipe and having a vertical central bore, and a fuel intake duct leadingdownwardly from said bore, said valve having a fuel duct leading fromsaid central bore'toward the discharge end of the pipe, an air ductextending from said bore toward the intake end of said pipe, and a ducteither wholly or partially while the air duct is closed.

2. In a carbureter, an intake pipe, a butterfiy valve in said intakepipe and having a vertical central bore, and a fuel intakeduct leadingdownwardly from said bore, said valve having a fuel duct leading fromsaid central bore toward the discharge end of the pipe, an air ductextending from said bore toward the intake end of said ipe, and a thirdduct extending from said re to one side of said valve, said ducts beingarranged with their ends which communicate with said bore in a commonplane, and a slide valve movable in said bore and having its lower endbevelled on one side tothereby adapt said slide valve to be employed toopen or close said air duct either wholly or to any desired extent andto also close said third duct either wholly or partially while the airduct is closed.

3. In a carburetor, an intake pipe, a butterfly valve in said intakepipe, said valve having a thickened central portion and bevelled sidewalls which conver e forwardly and rearwardly toward each ot er from thesaid central portion and toward the. respective ends of said valve, andalso having a vertical central bore, and a fuel intake duct leadingdownwardly from said bore, saidpipe, an air duct extending from saidbore I toward the intake end of said pipe, and a third duct extendingfrom said bore to one side of said valve, and means to open or closesaid air duct either wholly or to any desired extent and to also closesaid third duct either wholly or partially whilethe air duct is closed.

In testimony whereof I aflix my signature in presence of two witnesses.

INGENIEUR DORE PORDES. Vitnesses:

GUIDO CORNI, RUDOLF SCHISKE.

